diff --git a/gc.c b/gc.c
index 099a1f382b..a5023d62d8 100644
--- a/gc.c
+++ b/gc.c
@@ -9362,18 +9362,20 @@ gc_set_candidate_object_i(void *vstart, void *vend, size_t stride, void *data)
     rb_objspace_t *objspace = &rb_objspace;
     VALUE v = (VALUE)vstart;
     for (; v != (VALUE)vend; v += stride) {
-        switch (BUILTIN_TYPE(v)) {
-          case T_NONE:
-          case T_ZOMBIE:
-            break;
-          case T_STRING:
-            // precompute the string coderange. This both save time for when it will be
-            // eventually needed, and avoid mutating heap pages after a potential fork.
-            rb_enc_str_coderange(v);
-            // fall through
-          default:
-            if (!RVALUE_OLD_P(v) && !RVALUE_WB_UNPROTECTED(v)) {
-                RVALUE_AGE_SET_CANDIDATE(objspace, v);
+        asan_unpoisoning_object(v) {
+            switch (BUILTIN_TYPE(v)) {
+            case T_NONE:
+            case T_ZOMBIE:
+                break;
+            case T_STRING:
+                // precompute the string coderange. This both save time for when it will be
+                // eventually needed, and avoid mutating heap pages after a potential fork.
+                rb_enc_str_coderange(v);
+                // fall through
+            default:
+                if (!RVALUE_OLD_P(v) && !RVALUE_WB_UNPROTECTED(v)) {
+                    RVALUE_AGE_SET_CANDIDATE(objspace, v);
+                }
             }
         }
     }